How to define these patches
 

Dear all,

First thank you for your attention.

I want to name the circle patches as "circle1","circle2",....

I write the following code:

-----------------------
For t In {1:101}
char add= (char) t;
Physical Surface(StrCat("circle",add)) = {e1[8+4*t]:e1[11+4*t]} ;
EndFor
-----------------------

When it is loaded, I get:
problem 1. add: unknown variable,
problem 2. I visualize the patch, and I could only get one patch named "circleadd", NOT "circle1".

If some of you have this experience, would you please give me any suggestions?

Thank you very much.

Bin

Have a look at the BNS syntax
 

Have a look at the BNS syntax of character expressions in Gmsh in section 2.1.2. It does not support a declaration like your 2nd line.

One suggestion is to simply replace what your are trying to do (convert t to a char and concatenate it with the string "circle") with the Sprintf() function. Have a look at the tutorial t8.geo in section 7.8 of the manual for an example of how this is done.

Dear Martin, As you said, i
 

Dear Martin,

As you said, it works now with the function "Sprintf()". Thank you.

Best regards,

Bin

Dear Martin and other friends,
 

Dear Martin and other friends,

When I want to define the boundary condition for my circles in the file 0/U, for an example,

I tried many ways, but failed:

// for (int t=1;t<=101;t++)
// {
// Sprintf("circle%g", t)
// "circle".merge(1:101);
// "circle".push_back(1)
// circle.merge(1)
"circle".append(1)
{
type slip;
}
// }

I write here, just to see if some one knows how to define those patches: circle1, circle2, ... Not by hand. Otherwise it is a lot of work.

Thank you for your attention.

Bin

You are again using a syntax n
 

You are again using a syntax not recognized by Gmsh. For instance, the C++ string push_back() function for appending characters to a string is unknown to the Gmsh parser.

To name your circle patches it should be possible to get through it using the Sprintf() function provided by Gmsh, though I haven't tried.

Ok, I see you have another pos
 

Ok, I see you have another post about the same problem and have received some hlp there:

http://www.cfd-online.com/OpenFOAM_D...es/1/8536.html

Hi Martin, This problem is
 

Hi Martin,

This problem is solved in the file 0/U and 0/p as the suggestions in the link.

I am implementing my boundary for those circles now, and I am sure to finish them soon.

Thank you.

Bin